A laser-based technique that measures not just what light a mineral emits, but how long that glow takes to fade, has found corundum — the crystalline aluminum oxide that makes rubies and sapphires — ...
A 'selfie' taken by the Curiosity rover taken on the Martian surface. Courtesy of NASA/JPL-Caltech/MSS Courtesy of NASA/JPL-Caltech/MSS For decades, Mars has surprised scientists with evidence of ...
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